It's a component to make all kinds of Jewellery: Rings, Necklaces, Bracelets & Amulets.
gold bars
Almost anything in you inventory, what it means by turn into gold is turning an item into coins not coloring them gold.
A quest item can be any item on Gaia that a user is saving gold to get. Quest bars are common in signatures, which shows how close the user is to completing their quest.
Buttons.
try dragon-gate.com. They have this item. it is $28.00 for 3 bars.
No.
Just search for 'Runescape item ID database' and you'll find multiple services to search for item ID's.
There is no NPC, place, or item in RuneScape called "Kela."
No.
Buying Runescape gold is against the rules of Runescape. In any case, it is not clear how you are planning to pay. You can go to a site that sells Runescape gold - at your own risk, since any such transfer is against the rules of Runescape - and see what payment options they have.
bronze dagger
No they do not have to be, but when it comes to selling, the buyer would have no guarantee as to the purity of the gold bar and therefore no idea of what price to pay. The gold bar would need to be 'assayed' in order to determine its purity and content. This is a time-consuming activity and makes selling your gold bar a slower and trickier process. The point about stamped gold bars is that they authenticate the content, weight and purity of the gold bullion. Certain refineries around the world are recognised by the world's main bullion exchanges making buying and selling their gold bars a much more smoother and trusted process. Credit Suisse gold bars for example are manufactured by Valcambi whose assayer stamp CHI Essayeur Fondeur decorates every bar. These bars are therefore popular with investors as they are easy to buy and sell. The stamp is globally recognised and assures the buyer and seller of authenticity.